We know that the total volume of the solution is 187 cubic feet. 187=3x+8x 187=11x 17=x Now we know that the ratio 3 to 8 is 51 to 136. Double check, (3*17)+(8*17)=187. I'm not sure which part of the ratio is water, but knowing this information, you should be able to solve it. I believe it may be this: The total volume of milk is 51. If the rest of the solution is water, then 187-51=136.